Do foliar, litter, and root nitrogen and phosphorus concentrations reflect nutrient limitation in a lowland tropical wet forest?
Do foliar, litter, and root nitrogen and phosphorus concentrations reflect nutrient limitation in a lowland tropical wet forest?
复制标题
DOI：
10.1371/journal.pone.0123796
复制
发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Mack MC
中科院分区：
文献类型：
--
作者：
Alvarez-Clare S;Mack MC
了解净初级生产力（NPP）的养分限制对于预测植物群落如何响应环境变化至关重要。植物叶片养分，尤其是氮磷浓度（[N]和[P]）及其比值，已被广泛用作植物营养状况的指标，并与NPP的养分限制直接相关。然而，在热带系统中，大量的混杂因素可能会限制根据植物群落的化学计量信号来预测养分限制的能力--正如NPP对施肥的反应所机械定义的那样。我们在哥斯达黎加的一个低地热带潮湿森林中进行了一个长期的全因子N和P施肥实验，以探索组织（叶、凋落物和根）[N]和[P]如何随施肥而变化，不同的树木大小等级和类群如何影响群落反应，以及组织营养物质与NPP的关系。与NPP对施肥的反应一致，施肥后两年，群落范围内的叶片[N]和[P]没有变化。凋落物[N]随N增加而增加，根系[P]随P增加而增加。最常见的树种（Pentaclethra macroloba）与NP添加物相比平均叶[N]增加了9%，最常见的棕榈物种（Socratea exohrriza）与P和NP添加物相比平均叶[P]分别增加了15%和19%。此外，N：P比值不指示NPP施肥反应，无论是在社区或在类群水平。我们的研究表明，在这些不同的热带森林中，组织[N]和[P]是由多种因素的相互作用驱动的，并不总是指示植物群落的营养状况。
Understanding nutrient limitation of net primary productivity (NPP) is critical to predict how plant communities will respond to environmental change. Foliar nutrients, especially nitrogen and phosphorus concentrations ([N] and [P]) and their ratio, have been used widely as indicators of plant nutritional status and have been linked directly to nutrient limitation of NPP. In tropical systems, however, a high number of confounding factors can limit the ability to predict nutrient limitation —as defined mechanistically by NPP responses to fertilization— based on the stoichiometric signal of the plant community. We used a long-term full factorial N and P fertilization experiment in a lowland tropical wet forest in Costa Rica to explore how tissue (foliar, litter and root) [N] and [P] changed with fertilization, how different tree size classes and taxa influenced the community response, and how tissue nutrients related to NPP. Consistent with NPP responses to fertilization, there were no changes in community-wide foliar [N] and [P], two years after fertilization. Nevertheless, litterfall [N] increased with N additions and root [P] increased with P additions. The most common tree species (Pentaclethra macroloba) had 9 % higher mean foliar [N] with NP additions and the most common palm species (Socratea exohrriza) had 15% and 19% higher mean foliar [P] with P and NP additions, respectively. Moreover, N:P ratios were not indicative of NPP responses to fertilization, either at the community or at the taxa level. Our study suggests that in these diverse tropical forests, tissue [N] and [P] are driven by the interaction of multiple factors and are not always indicative of the nutritional status of the plant community.
登录
查看更多内容
影响因子：
64.8
作者：
Davidson, Eric A.;de Carvalho, Claudio J. Reis;Martinelli, Luiz A.
通讯作者：
Martinelli, Luiz A.
影响因子：
5.5
作者：
Hidaka, Amane;Kitayama, Kanehiro
通讯作者：
Kitayama, Kanehiro
影响因子：
9.4
作者：
Haettenschwiler, Stephan;Aeschlimann, Beat;Bonal, Damien
通讯作者：
Bonal, Damien
影响因子：
5.2
作者：
Andersen, Kelly M.;Corre, Marife D.;Dalling, James W.
通讯作者：
Dalling, James W.
影响因子：
3.7
作者：
Harrington, RA;Fownes, JH;Vitousek, PM
通讯作者：
Vitousek, PM